Boat-hull.



C. A. PFEIFFER.

\ BOAT HULL.

APPLICATION FILED MAR. 22. I916. I 1 04,058. Patented Nov. 7, 1916.

INVENTOR A NOR/V578 CARL A. PFEIFFER, OF NEW YORK, N. Y.

BOAT-HULL.

Application filed March 22, 1916.

To all whom it may concern:

Be it known that I, CARL A. PFEIFFER, a citizen of the United States, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented new and useful Improvements in Boat-Hulls, of which the following is a full, clear, and exact description.

The invention relates to shipbuilding, and its object is to provide certain new and useful improvements in building boat hulls of wood or sheet metal, and whereby an exceedingly strong and durable hull is produced in a very simple and economical manner.

In order to accomplish the desired result, use is made of a flat blank of approximately trapezoidal shape and bent to provide a doubled-up bow, a bottom gradually increas ing in width from the bow to the stern and sides gradually decreasing in height from the bow to the stern.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a plan view of a flat wood blank for forming the main portion of the hull; Fig. 2 is a plan view of the stern board; Fig. 3 is a side elevation of the boat hull; Fig. 4: is an inverted plan view of the same; Fig. 5 is a front end view of the boat hull; Fig. 6 is a rear end view of the same; and Fig. 7 is a plan view of a sheet metal blank for forming the boat hull.

The boat hull is formed from a single flat blank 10 of an approximately trapezoidal or keystone shape having parallel apex and base lines 11 and 12 and equilateral sides 13 with the outer portion of the base line 12 slightly inclined rearwardly and outwardly, as plainly indicated in Fig. 1. The blank 10 may be formed from a single piece of sheet metal, as shown in Fig. 7 or is built up by the use of wooden planks 15 extending longitudinally and joined at their sides, as plainly shown in Fig. 1. The planks 15 are fastened together suitable ribs 16. The wooden or sheet metal blank 10 is next bent over a suitable mold by suitable bending machinery and preferably under the application of steam or other heating medium, to provide a doubledup bow 20 of vertical shape, a bottom 21 gradually increasing in width from the bow 20 to the stern, and sides 22 decreasing in Specification of Letters Patent.

at their upper faces by Patented Nov. '7, 1916. Serial N 0. 85,884.

height from the bow 20 to the stern and which stern ends 23 are inclined upwardly and reai'wardly, as plainly indicated in Figs. 3 and 4:. The lower portions of the sides 22 merge gradually with the side portions of the bottom 21, as will be readily understood by reference to Figs. 5 and 6. After the blank has been bent into hull shape, as described, then a stern board 24 is attached to the bottom 21 and the stern ends 23 of the sides 22 to complete the hull.

It is understood that the boat hull shown and described can be cheaply manufactured either of wood or sheet material to provide an exceedingly strong and durable hull, not liable to lose its shape or leak. It will further be noticed that by the arrangement described no curved planks are used in the construction of the hull and, in general, the hull can be produced in a comparatively short time and in an exceedingly economical manner.

Having thus claim as new ters Patent:

1. A boat hull formed from a flat blank of approximately trapezoidal shape and bent to provide a doubled-up sharp bow, a bottom gradually increasing in width from the bow to the stern, and sides gradually decreasing in height from the bow to the stern.

2. A boat hull formed from a fiat blank of approximately trapezoidal shape and formed of longitudinally extending planks arranged side by side, and cross ribs attached to the upper faces of the planks, the blank being bent to provide a doubled-up sharp bow, a bottom gradually increasing in width from the bow to the stern, and sides gradually decreasing in height from the bow to the stern.

3. A boat hull formed from a fiat blank of approximately trapezoidal shape bent to provide a doubled-up sharp vertical bow, a bottom gradually increasing in width from the bow to the stern, and sides rounded 011" at their lower portions to gradually merge with the side portions of the said bottom.

4. A boat hull formed from a flat blank of approximately trapezoidal shape bent to provide a doubled-up sharp vertical bow, a bottom gradually increasing in width from the bow to the stern, and sides rounded oil at their lower portions to gradually merge with the side portions of the said bottom,

ends 23,

described my invention, I and desire to secure by Letthe said sides gradually decreasing in ends of the said sides being inclined upheight from the bow to the stern. p wardly and rearwardly.

5. A boat hull formed from a fiat blank of In testimony whereof I have signed my approximately trapezoidal shape and having name to this specification in the presence of 5 the side portions of its stern end flaring t'wo si'lhscribing Witnesses.

rearwardly, the said blank being bent to proyide a doubled-up how, a bottom gradu- CARL PFEIFFER' ally increasing in Width from the bow to W itnesses: the stern, and sides gradually decreasing in THEo G. HOSTER,

10 height from the bow to the stern the stern GEORGE H. EMsLIE.

Copies of this patent ma be obtained for five cents each, by addressing the Commissidnerof Patents,

Washington, D. 0. 

